feat: Implement routines feature with CRUD operations and child assignment

- Add backend routines management with add, get, update, delete, and list functionalities.
- Create models for Routine, RoutineItem, RoutineSchedule, and RoutineExtension.
- Develop event types for routine confirmation and modification.
- Implement frontend components for routine assignment, confirmation dialog, and routine management views.
- Add unit tests for routine API and integration tests for routine CRUD flow.
- Create end-to-end test plan for routines feature covering parent and child interactions.

backend/api/routine_item_api.py

@@ -0,0 +1,126 @@
+from flask import Blueprint, request, jsonify
+from tinydb import Query
+
+from api.utils import get_validated_user_id, send_event_for_current_user
+from db.db import routine_db
+from db.routine_items import add_item, delete_item, get_item, get_items_for_routine, update_item
+from events.types.event import Event
+from events.types.event_types import EventType
+from events.types.routine_modified import RoutineModified
+from models.routine_item import RoutineItem
+
+routine_item_api = Blueprint('routine_item_api', __name__)
+
+
+def _validate_routine_owned_by_user(routine_id: str, user_id: str):
+    q = Query()
+    return routine_db.get((q.id == routine_id) & ((q.user_id == user_id) | (q.user_id == None)))
+
+
+@routine_item_api.route('/routine/<routine_id>/item/add', methods=['PUT'])
+def add_routine_item(routine_id):
+    user_id = get_validated_user_id()
+    if not user_id:
+        return jsonify({'error': 'Unauthorized', 'code': 'UNAUTHORIZED'}), 401
+
+    routine = _validate_routine_owned_by_user(routine_id, user_id)
+    if not routine:
+        return jsonify({'error': 'Routine not found'}), 404
+
+    data = request.get_json() or {}
+    name = data.get('name', '').strip()
+    image_id = data.get('image_id')
+
+    if not name:
+        return jsonify({'error': 'name is required'}), 400
+
+    existing_items = get_items_for_routine(routine_id)
+    order = data.get('order', len(existing_items))
+
+    item = RoutineItem(routine_id=routine_id, name=name, image_id=image_id, order=order)
+    add_item(item)
+
+    send_event_for_current_user(
+        Event(EventType.ROUTINE_MODIFIED.value, RoutineModified(routine_id, RoutineModified.OPERATION_EDIT))
+    )
+    return jsonify(item.to_dict()), 201
+
+
+@routine_item_api.route('/routine/<routine_id>/item/<item_id>/edit', methods=['PUT'])
+def edit_routine_item(routine_id, item_id):
+    user_id = get_validated_user_id()
+    if not user_id:
+        return jsonify({'error': 'Unauthorized', 'code': 'UNAUTHORIZED'}), 401
+
+    routine = _validate_routine_owned_by_user(routine_id, user_id)
+    if not routine:
+        return jsonify({'error': 'Routine not found'}), 404
+
+    existing = get_item(item_id)
+    if not existing or existing.routine_id != routine_id:
+        return jsonify({'error': 'Item not found'}), 404
+
+    data = request.get_json(force=True) or {}
+    is_dirty = False
+
+    if 'name' in data:
+        name = data.get('name', '').strip()
+        if not name:
+            return jsonify({'error': 'name cannot be empty'}), 400
+        existing.name = name
+        is_dirty = True
+
+    if 'image_id' in data:
+        existing.image_id = data.get('image_id')
+        is_dirty = True
+
+    if 'order' in data:
+        order = data.get('order')
+        if not isinstance(order, int) or order < 0:
+            return jsonify({'error': 'order must be a non-negative integer'}), 400
+        existing.order = order
+        is_dirty = True
+
+    if not is_dirty:
+        return jsonify({'error': 'No valid fields to update'}), 400
+
+    update_item(existing)
+    send_event_for_current_user(
+        Event(EventType.ROUTINE_MODIFIED.value, RoutineModified(routine_id, RoutineModified.OPERATION_EDIT))
+    )
+    return jsonify(existing.to_dict()), 200
+
+
+@routine_item_api.route('/routine/<routine_id>/item/<item_id>', methods=['DELETE'])
+def delete_routine_item(routine_id, item_id):
+    user_id = get_validated_user_id()
+    if not user_id:
+        return jsonify({'error': 'Unauthorized', 'code': 'UNAUTHORIZED'}), 401
+
+    routine = _validate_routine_owned_by_user(routine_id, user_id)
+    if not routine:
+        return jsonify({'error': 'Routine not found'}), 404
+
+    item = get_item(item_id)
+    if not item or item.routine_id != routine_id:
+        return jsonify({'error': 'Item not found'}), 404
+
+    delete_item(item_id)
+    send_event_for_current_user(
+        Event(EventType.ROUTINE_MODIFIED.value, RoutineModified(routine_id, RoutineModified.OPERATION_EDIT))
+    )
+    return jsonify({'message': 'Item deleted'}), 200
+
+
+@routine_item_api.route('/routine/<routine_id>/items', methods=['GET'])
+def list_routine_items(routine_id):
+    user_id = get_validated_user_id()
+    if not user_id:
+        return jsonify({'error': 'Unauthorized', 'code': 'UNAUTHORIZED'}), 401
+
+    routine = _validate_routine_owned_by_user(routine_id, user_id)
+    if not routine:
+        return jsonify({'error': 'Routine not found'}), 404
+
+    items = [item.to_dict() for item in get_items_for_routine(routine_id)]
+    return jsonify({'items': items, 'count': len(items)}), 200